0.1

0.1*2=0.2 0.000 1100 1100 1100
0.2*2=0.4 0.001100110011001100
0.4*2=0.8 0.0100 1100 1100 11001100 ..
0.8*2=1.6 0.30000000000....444

0.6*2=1.2
0.2*2=0.4
0.4*2=0.8


0.3000000...4


<script>
    var a = 0.1
    var b = 0.2
    console.log((a * 100 + b * 100) / 100 == 0.3)


</script>